In tomato plants, tall vine (D) is dominant over dwarf vine (d) and round fruit (0) is dominant over oval-shaped fruit (o). Two tall, round-fruit shape plants (plants 1 and 2) are crossed with dwarf, oval-shape fruit plants. The results are as follows: PLANT 1 Tall, round x dwarf, oval-shape Phenotypic classes Tall, round Dwarf, oval Tall, oval Dwarf, round PLANT 2 Tall, round x dwarf, oval-shape Phenotypic classes Numbers Numbers Tall, round Dwarf, oval Tall, oval Dwarf, round 81 21 79 19 22 77 18 83 Total 200 Total 200 a. Why is there a difference in the proportionate number of plants in each phenotypic class of the offspring resulting from test crosses of plants 1 and 2? b. Calculate the recombination frequency between the genes D/d and 0/o in tomatoes. c. Draw a chromosome map for these genes. (Use underscore (_) to draw the line for the map)
In tomato plants, tall vine (D) is dominant over dwarf vine (d) and round fruit (0) is dominant over oval-shaped fruit (o). Two tall, round-fruit shape plants (plants 1 and 2) are crossed with dwarf, oval-shape fruit plants. The results are as follows: PLANT 1 Tall, round x dwarf, oval-shape Phenotypic classes Tall, round Dwarf, oval Tall, oval Dwarf, round PLANT 2 Tall, round x dwarf, oval-shape Phenotypic classes Numbers Numbers Tall, round Dwarf, oval Tall, oval Dwarf, round 81 21 79 19 22 77 18 83 Total 200 Total 200 a. Why is there a difference in the proportionate number of plants in each phenotypic class of the offspring resulting from test crosses of plants 1 and 2? b. Calculate the recombination frequency between the genes D/d and 0/o in tomatoes. c. Draw a chromosome map for these genes. (Use underscore (_) to draw the line for the map)
Concepts of Biology
1st Edition
ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:Samantha Fowler, Rebecca Roush, James Wise
Chapter8: Patterns Of Inheritance
Section: Chapter Questions
Problem 5RQ: Imagine that you are performing a cross involving seed texture in garden pea plants. You cross...
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